Revolving doors

ABSTRACT

A revolving door having an inner shell having a doorway therein and rotatably supported at its top from an outer shell having a plurality of doorways, for rotation into position to align the inner doorway with respective ones of the outer doorways, with wheels on the lower portion of the inner shell operatively engaged with a relatively vertically thin track on the bottom of the outer shell for holding the inner shell against horizontal movement.

United States Patent [191 Nineberg REVOLVING DOORS [75] Inventor: Edward Nineberg, Evanston, Ill.

[73] Assignee: Consolidated International Corporation, Chicago, Ill.

22 Filed: July 5, i974 2| Appl.No.:486,l20

[52] US. Cl. 4, 49/41 [51] Int. Cl E06!) 3/34 [58] Field of Search 49/40, M; 109/3, 69; 52/2 [56] References Cited UNITED STATES PATENTS 475,l57 5/1892 Shanafelt 49/41 X 2,081,271 5/l937 Ellithorpe 109/9 X [4 1 July 8, 1975 4/1972 Anderson 49/41 X 8/l974 Duquette 49/4l X Primary Examiner-Kenneth Downey Attorney, Agent, or Firm-Johnson, Dienner, Emrich & Wagner [57] ABSTRACT A revolving door having an inner shell having a doorway therein and rotatably supported at its top from an outer shell having a plurality of doorways, for rotation into position to align the inner doorway with respective ones of the outer doorways, with wheels on the lower portion of the inner shell operatively engaged with a relatively vertically thin track on the bottom of the outer shell for holding the inner shell against hori zontal movement.

10 Claims, 10 Drawing Figures PATENTEHJUL 8 ms SHEET lllllllllllllllll I! REVOLVING DOORS BACKGROUND OF THE INVENTION The present invention relates to revolving doors, and, more particularly, to revolving doors of the type which are particularly well adapted for use in connection with darkrooms, dust-free rooms, and the like.

It is a primary object of the present invention to afford a novel revolving door.

Another object of the present invention is to afford a novel revolving door having an inner shell, having a doorway in one side thereof, rotatably mounted in an outer shell having a plurality of doorways therein, for rotation of the inner shell into various positions to selectively dispose the inner doorway in alignment with respective ones of the outer doorways for ingress and egress therethrough relative to the inner shell.

Revolving doors having an inner shell rotatably mounted in an outer shell for rotation around a vertical axis to selectively align a doorway in the inner shell with respective ones of a plurality of doorways in the outer shell have been heretofore known in the art. In fact, revolving doors of such a type wherein the inner shell is suspended at its top from the outer shell for rotation around a vertical axis within the outer shell, and having members, such as wheels mounted on the lower end portion of the inner shell in position to horizontally engage portions of the outer shell for holding the inner shell against transverse or horizontal swaying or movement have been heretofore known in the art. However, revolving doors of such a type heretofore known in the art, have had several inherent disadvantages, such as, for example, embodying annular members on the bottom of the outer shell which were of substantial vertical height and extended across the doorways in the outer shell to thereby afford undesirable obstructions to ready ingress and egress through the doorway of the re volving door; or being of such construction as to require the use of a special ramp for sliding or rolling an article or cart into and out of the door, and the like. It is an important object of the present invention to overcome such disadvantages.

Revolving doors of the type embodying an inner member disposed around a center post and rotatably supported by the post within an outer member, also, of course, have been heretofore known in the art. However, such revolving doors have had several inherent disadvantages, such as, for example, having limited, accessable internal space available in the inner member because of the obstruction thereto afforded by the center post thereof, and the like. It also is an object of the present invention to overcome the disadvantages of the last mentioned type of revolving door.

Another object of the present invention is to afford a novel revolving door of the type embodying an inner shell rotatably mounted for rotation around a vertical axis within an outer shell, and wherein the interior of the inner shell is substantially free from obstruction to people and materials moving into and out of the inner shell.

Another object of the present invention is to afford a novel revolving door of the last mentioned type and wherein the lower end portion thereof is restrained in a novel and expeditious manner against a lateral or horizontal movement within the outer shell.

Yet another object of the present invention is to af ford a novel revolving door of the last mentioned type wherein the inner shell embodies follower members in the form of wheels, or the like, engageable with an annular track which extends around the bottom of the outer shell.

An object ancillary to the foregoing is to afford a novel revolving door of the aforementioned type, wherein the track is of such limited vertical height across the openings or doorways in the outer shell as to afford substantially no obstruction to the passage of people and materials through the openings or doorways.

Another object of the present invention is to afford a novel revolving door which is practical and efficient in operation, and which may be readily and economically produced commercially.

Other and further objects of the present invention will be apparent from the following description and claims and are illustrated in the accompanying drawings which, by was of illustration, show the preferred embodiments of the present invention and the principles thereof and what I now consider to be the best mode in which I have contemplated applying these principles. Other embodiments of the invention embodying the same or equivalent principles may be used and structural changes may be made as desired by those skilled in the art without departing from the present invention and the purview of the appended claims.

DESCRIPTION OF THE DRAWINGS In the drawings:

FIG. I is a front elevational view of a revolving door embodying the principles of the invention;

FIG. 2 is a somewhat diagramatic horizontal sectional view through the door shown in FIG. 1;

FIG. 3 is a view similar to FIG. 2, but showing a door with a different number of doorways therein;

FIG. 4 is a fragmentary, top plan view of the door shown in FIG. 1;

FIG. 5 is an enlarged, detail sectional view taken substantially along the line of 5-5 in FIG. 4;

FIG. 6 is an enlarged, detail sectional view taken substantially along the lines of 66 in FIG. 4',

FIG. 7 is a detail, sectional view taken substantially along the line 7-7 in FIG. 6, but with the wheel removed and the position thereof indicated by broken lines;

FIG. 8 is a fragmentary, horizontal detail section portion of through a portion of the door shown in FIG. 4;

FIG. 9 is a sectional detail sectioned view, similar to FIG. 6, but showing a modified form of the present invention; and

FIG. 10 is a fragmentary, detail sectional view, similar to FIG. 9, but showing another modified form of the present invention.

DESCRIPTION OF THE EMBODIMENTS SHOWN HEREIN A revolving door I, embodying the principles of the present invention, is shown in FIGS. l 8 of the drawings to illustrate the presently preferred embodiment of the present invention.

The revolving door I embodies, in general, an elon gated, substantially cylindrical-shaped inner shell 2 rotatably mounted in a similarly shaped outer shell 3, FIG. I. The shells 2 and 3 may be made of any suitable material, such as, for example, sheet steel, and are round in transvers cross section, the diameter of the inner shell 2 being sufficiently less than the diameter of the outer shell 3 to insure free rotation of the inner shell 2 around the vertical, longitudinal axis of the door 1, within the shell 3.

The inner shell 2 has one opening 4 disposed in one side of the side wall 5 thereof, and, preferably, extending the full length thereof, and the outer shell 3 has a plurality of openings 6 such as the two openings 6 shown in FlG. 2, extending through respective portions of the side wall 7 thereof, the openings 6 preferably extending the full length of the side wall 7. lf desired, the outer shell 3 may have more than two openings 6 therein, such as, for example, three openings 6, as illustrated in FIG. 3, for a purpose which will be discussed in greater detail presently.

The outer shell 3 includes a top wall 8 mounted on, and closing the upper end of the side wall 7, FIGS. 1 and 4. Three reinforcing members 9, l0 and 11, which are preferably in the form of angle-irons, extend across the central portion of the top wall 8 in substantially parallel relation to each other. Similarly, a suitable number of elongated reinforcing members, such as the four reinforcing members 12 shown in FIG. 1, are mounted on the outer face of the side wall 7 in spaced relation to each other. Preferably, each of the reinforcing members 12 is disposed adjacent to a respective edge of one of the openings 6. The reinforcing members 9ll and the reinforcing members 12 may be secured to the top wall 8 and the side wall 7, respectively, by suitable means such as, for example, welding and enhance the stiffness and structural strength of the outer shell 3.

The inner shell 2 has a top wall 13, FIG. 5, which is mounted on and completely closes the upper end of the side wall 5. In the preferred form of the invention, a reinforcing member 14, in the form ofa steel plate, or the like, is mounted on and extends substantially diametrically across the lower face of the top wall 13 to enhance the stiffness and structural strength of the latter.

The top wall 8 of the outer shell 3 has a depression or cup formed in the center thereof, and a bearing 16 is mounted in the cup 15. The reinforcing member 14, the top wall 13 of the inner shell 2, the cup 15 and the bearing 16 each have openings l7, l8, l9 and 20, re spectively, extending vertically through the centers thereof, FIG. 5, and a bolt 21, having a head 22 on one end thereof extends vertically through the openings 17-20 and is secured therein, with the head 22 disposed in abutting engagement with the lower face of the reinforcing member 14, by nuts 23, which press a washer 24 downwardly against the upper face of the bearing 16. In this manner, the inner shell 2 is rotatably supported from its top, by the top wall 8 of the outer shell 3, for rotation around the longitudinal axis of the outer shell 3. The reinforcing member 10 on the top wall 8 of the outer shell 3 has an opening 25 extending through the horizontal flange 26 and the vertical flange 27 thereof for accommodating insertion and removal of the bolt 21, and the associated parts, relative to the top walls 8 and 13 of the outer shell 3 and the inner shell 2, respectively, and for affording access to the nuts 23 for tightening and loosening the same.

Wheel assemblies 28, each of which embodies a wheel 29 rotatably and swivelably mounted on a bracket 30, as shown in FIG. 6, are secured to the outer face of the lower end portion of the side wall 7 of the outer shell 3 in suitably spaced relation to each other for supporting the revolving door 1 in such a manner that it can be moved across a supporting surface, such as, for example, a floor, or the like, on the wheels 29, with the bottom edge of the outer shell 3 disposed in spaced, closely adjacent relation to the floor, or the like.

The revolving door 1 embodies two elongated flanges 31 and 32 extending longitudinally of the side wall 7 on opposite sides thereof and in substantially uniplanar relation to each other and to the flange 27 of the reinforcing member 10. With this construction, the revolving door 1 may be readily moved into and out of operative position relative to a doorway, such as the doorway 33, shown in FIGS. 2 and 4. Preferably, when the revolving door 1 is so disposed in a doorway such as the doorway 33, the flanges 27 is disposed in abutting, overlying re lation to the top of the jamb of the doorway, and the flanges 31 and 32 are disposed in abutting, overlying relation to respective opposite sides of the door jamb, to thereby afford an effective light-free and dust-free seal between the revolving door 1 and the jamb of the doorway in which it is disposed. If desired, dust shields 34, FIG. 6, in the form of sections of flexible tubular members made of suitable material, such as, for exam ple, rubber, may be secured to the lower edge portion of the side wall 7 of the outer shell 3 in position to extend therealong betwen the doorways 6 so as to afford added protection against the passage of light and dust through the doorway 33 when the revolving door 1 is disposed in operative position therein.

Revolving doors embodying an inner shell rotatably suspended from an outer shell, with the inner shell having a single passageway or doorway therethrough and the outer shell having two or more passageways or doorways therethrough and with the revolving door mounted on rollers for movement into and out of oper ative position relative to a doorway have been heretofore known in the art. Heretofore, insofar as is known, when such revolving doors have been mounted in doorways, they have been permanently secured to the door frames by screws, or the like, or have been hingedly connected to one side of the door frame. The present invention affords a novel revolving door, which, when it is mounted in operative position in a doorway, is firmly held in such position for normal use, but can be quickly and easily completely removed from the doorway, if desired. This, or course, is of particular importance in emergencies, such as, for exam ple, in the case of fire, or the like.

Such securing of the preferred form of the revolving door 1 as shown in the drawings in a doorway, such as the doorway 33, is effected by two latch members 35 and 36. of a type well known in the art, secured to the outer faces of the flanges 31 and 32, respectively, FIG. 4. Each of the latch members 35 and 36 embodies a plunger 37 slidably mounted in a housing 38, with a compression coil spring 39 yeilding urging the plunger 37 into outwardly projecting relation relative to the housing 38, as illustrated with respect to the latch member 35 in FIG. 8. Two keeper plates 40, each having an opening 41 therein, FIG. 8, are mounted on the jamb of the doorway 33, by means of mounting brackets 42, in such postion that the openings 41 are disposed in position to receive the rounded outer ends 43 of the plungers 37 of the respective latch members 35 and 36 when the revolving door 1 is disposed in operative position in a doorway, such as the doorway 33. The holding force afforded by the engagement of the latches 35 and 36 with the keepers 37 is sufficient to hold the revolving door 1 in operative position in the doorway 33, during normal operation of the door 1. However, if desired, such as, for example, in the event of an emergency, such as fire by applying manual pressure to the revolving door 1 in a direction to move the latches 35 and 36-outwardly away from the adjacent door jamb, the latches 35 and 36 may be released from the keepers 40 and the entire revolving door 1 moved out of the doorway 33 to thereby completely clear the latter.

In FIG. 2, the revolving door 1 is shown with only two openings 6 in the outer shell thereof, and mounted in a single doorway 33. However, that is merely by way of illustration, and not by way of limitation, and the revolving door 1 may be constructed with more than two openings 6 therein, and for use between more than two rooms, such as, for example, with three openings 6 therein and for use for interconnecting three rooms, as shown in FIG. 3. With either type of construction, in the operation of the revolving door 1, personnel or ma terial will pass through one doorway 6 in the outer shell 3, which is aligned or in registration with the doorway 4 in the inner shell 2, and the inner shell 2 will then be rotated manually, or otherwise, into position wherein the doorway 4 is disposed in adjacent alignment with the desired other one of the doorways 6 for passage of the personnel or material outwardly through the latter doorway.

It will be remembered that the inner shell 2 is rotatably supported from the top wall 8 of the outer shell 3 by the bolt 21, and that the side wall 5 of the inner shell 2 is spaced inwardly from the sidewall 7 of the outer shell 3. As a result, without any additional support being afforded for the inner shell 2, the lower end portion thereof would tend to swing or mover transversely, in a horizontal direction, around the connection af forded by the bolt 21 between the shells 2 and 3. In the past, lateral support for the lower end portion of the inner shells of revolving doors of the general type of that shown herein have been afforded by wheels rotatably mounted on vertically extending axes attached to the inner shells, with the wheels engaged with annular abutment members of considerable height, such as the vertical flange of annular-shaped angle-irons secured to the inner face of the lower end portion of the outer shells of such revolving doors. Such abutment members have afforded highly undesirable obstructions to the ingress and egress of persons and supplies, and the like, through the doorways of the revolving doors embodying the same. They afforded obstructions which were likely to trip people passing inwardly or outwardly through the doorways of such a door. Also, they afforded obstructions over which it was difficult, if not impossible, to roll push carts, and the like, without special ramps being placed over the obstruction in the doorway.

The present invention affords a novel construction, wherein, although the inner shell 2 is effectively held against transverse, horizontal movement in the outer shell 3, this is effected without the use of structure which affords any serious obstruction to the passage of people or carts, or the like, into and out of the revolving door 1. Thus, for example, in the preferred form of the revolving door 1 shown in FIGS. 1 to 8, inclusive, of the drawings, an annular ring 44 is mounted on the lower end of the side wall 7 of the outer shell 3 in radially inwardly extending position relative thereto, FIG. 6. The ring 44 may be made of any suitable material, such as, for example, sheet steel and preferably has a thickness of not substantially less than 1/16 of an inch and not substantially more than Vs of an inch, and preferably, is 3/32 of an inch thick. The ring 44 may be secured to the lower end of the side wall 7 of the outer shell 3 in any suitable manner, but preferably is secured thereto by welding the same to curved, elongated supporting members 45, in the form of angle-irons, which have vertically extending flanges 46 welded or otherwise suitably secured to the inner face of the lower end portion of the side wall 7, and have horizontally extending flanges 47, which project radially inwardly from the lower edges of the flanges 46, the ring 44 being welded or otherwise secured to the lower faces of the flanges 47. The supporting members 45 are secured to the side wall 7 between the doorways 6, and they terminate at their ends in inwardly spaced relation to the latter, so that no portions of the supporting members 45 project into the doorways 6.

An annular track 48 in the form of an upwardly projecting ridge is integrally formed in the ring 44 in radially inwardly spaced relation to the supporting members 45, FIG. 6. Preferably, the side wall 5 is spaced inwardly from the side walls 7 not substantially less than 3/16 of an inch and not substantially more than 5/16 of an inch, and preferably, A of an inch; and, the track 48 is spaced inwardly from the side wall 7 not substantially less than one inch and not substantially more than 1% inches, and, preferably is spaced therefrom in the na ture of 1% inches.

A plurality of followers in the form of wheel assemblies 49, FIGS. 2 and 6, are mounted on the lower end portion of the sidewall 5 of the inner shell 2, in radially inwardly extending position relative thereto. The wheel assemblies 49 are identical in construction, and each embodies a wheel 50 rotatably mounted on a shaft 51, which projects horizontally from a bearing block 52, FIG. 6. The bearing blocks 52, are secured by bolts 53 to the lower, horizontally inwardly projecting flanges 54 of angle-iron supporting members 55, which have vertical flanges 56 secured to the outer face of the lower end portions of the side walls 5 by suitable means such as welding. All of the wheel assemblies 49 and supporting members 45 are disposed in spaced relation to the doorway 4 in the inner shell 2.

The bearing block 52 has an elongated opening 57, which is round in transverse cross-section, extending horizontally therethrough, and one end portion 58 of the shaft 51 is mounted in the opening 57, and is held against rotation therein by a set-screw 59. The other end portion 60 of the shaft 51 projects outwardly from the bearing block 52 and is eccentrically disposed relative to the end portion 58, the longitudinal axis of the end portion 60 being disposed in off-set, parallel relation to the longitudinal axis of the end portion 58, FIG. 7, for a purpose which will be discussed in greater detail presently.

The wheel 50 has an annular groove 61 extending around the periphery thereof, and is mounted on the end portion 60 of the shaft 51 in position to receive the track 48 in the groove 61 in the assembled revolving door 1. The wheel 50 is held on the shaft 51 by suitable means, such as, for example, a snap-ring 62, which is disposed outwardly away from the bearing block 52 a sufficient distance that the wheel 50 is disposed between the bearing block 52 and the snap-ring 62 with a slightly loose fit, as shown in FIG. 6.

It will be remembered that the end portion 60, of the shaft 51, on which the wheel 50 is mounted, is eccentrically disposed relative to the end portion 58. With this construction, the force with which the wheel 50 engages the track 48 may be adjusted by rotating the shaft 51 in the bearing block 52 to thereby raise or lower the end portion 60 of the shaft 5l relative to the end portion 58 thereof. Thus, for example, if it is desired to adjust the height of the wheel 50 relative to the track 48, shown in FIG. 6, the set screw 59 may be loosened to thereby free the shaft 51 for rotation in the bearing block 52, and by engaging a screwdriver in the screwdriver slot 63, FIG. 7, the shaft 51 may be rotated clockwise or counterclockwise, as viewed in FIG. 7, to thereby raise or lower the end portion 60 of the shaft SI, respectively. from the position shown in FIG. 7, to thereby correspondingly raise or lower the wheel 50 relative to the track 48. Thereafter, the set screw 59 may again be tightened to hold the shaft 51 in the adjusted position.

With this construction, the engagement of the wheel 50 with the track 48 may be adjusted so as to insure that it will effectively engage the track 48 for holding the lower end portion of the inner shell 2 against undesired lateral or horizontal movement, relative to the outer shell 3, without engaging the track 48 with such force as to produce bindingv Preferably, the wheels 50 engage the track 48 with a relatively loose fit, which is insufficient to exert any substantial vertical force on the track 28, the vertical support for the inner shell 2 being afforded by the interconnection of the top wall 13 thereof with the top wall 8 of the outer shell 3 by the bolt 21.

In FIG. 9, a modified form of the present invention is shown, and parts which are identical to the parts shown in FIGS l8 are indicated by the same reference numerals, and parts which are similar to, but which have been substituted for parts shown in FIGS. 1-8 are indicated by the same reference numerals, with the suffix added thereto.

The revolving door Ia, shown in FIG. 9, is of the same construction as the revolving door 1, shown in FIGS. 1-8, except for changes made in the ring 44a and the wheel assemblies 49a As may be seen in FIG. 9, the track 480 in the ring 440 comprises an upwardly opening groove 63 disposed between ;two upwardly two ridges 64 and 65, the groove 63 and the ridges 64 and 65 being integrally formed in the ring 440. Also, the wheel 50a, instead of having an annular groove in the outer periphery thereof thereof, as in the wheel 50, has an annular ridge 61a extending therearound. In the operation of the revolving door la, the ridges 61a on the wheels 50a ride in the groove 63 of the track 48a, between the ridges 64 and 65. As in the revolving door 1, the engagement of the wheel 500 with the track 480 may be adjusted by rotating the shaft in the bearing block 52, and preferably is such as to exert no substan tial vertical force on the ring 44a.

In FIG. If), another modified form of the present invention is shown, and parts which are the same as the parts shown in FIGS. 1-8 are indicated by the same reference numerals, and parts which have been substituted for parts shown in FIGS. 1-8 are indicated by the same reference numerals with the suffix b added thereto.

The revolving door lb is of the same construction as the revolving door 1, except for the annular ring 44b, the wheel assemblies 49b, and the supporting members 45b and 55b. Thus, it will be seen that, in the revolving door lb, the annular ring 44b has no track integrally formed therein, the track 48b on the ring 44b being afforded by the inner edge portion of the horizontal flange 47b of the angle-iron supporting member 45b. In the revolving door 1b, unlike the supporting members 45 of the revolving door I, the supporting members 45b are annular in construction, the horizontal flanges 47b forming complete rings with the vertical flanges 46b being interrupted so that they terminate in inwardly spaced relation to the doorways 6 in the same manner as the entire supporting members 45 of the revolving door 1. The flanges 47b preferably are not substantially less than 3/32 of an inch thick or more than 5/32 of an inch thick and, preferably, are in the nature of Va of an inch thick. Therefore, the portion of the ring 44b, with the track thereon afforded by the flange 47b of the supporting member 45b, which extends across the doorway 6 is relatively thin, so that it affords substantially no obstruction as a practical matter, to the passage of people or carts, and the like, into and out of the revolving door lb.

The wheel assemblies 49b are of the same construction as the wheel assemblies 49, except that the bearing blocks 42b thereof are narrower in width, from left to right, as viewed in FIG. 10, and the wheels 50b, instead of having an annular groove extending therearound, in the manner of the wheel 50, have an annular shoulder 61b disposed on the side thereof remote from the side wall 7 of the outer shell. The shoulder 61b, in the as sembled revolving door lb, is disposed in abutting engagement with the inner edge portion of the flange 47b of the supporting member 45b, which, it will be remembered, affords the track 48b for the door construction shown in FIG. 10. The shaft 51b is of the same construction as the shaft 51, except that it is shorter in length, and it is mounted in the bearing block 42b in the same manner that the shaft 51 is mounted in the bearing block 42, so that the engagement of the wheel 49b with the track 48b may be adjusted in the same manner as heretofore discussed with respect to the adjustment of the engagment of the wheel 50 with the track 48.

Rather than have the width of the flange 54b of the supporting member 55b be sufficiently small that it will terminate at its inner edge portion in outwardly spaced relation to the wheels 50b, notches or recesses, such as the notch or recess 62 shown in FIG. 10, may be afforded in the inner edge portion thereof to accommodate each of the wheels 50b.

From the foregoing, it will be seen that the present invention affords a novel revolving door.

Also, it will be seen that the present invention affords a novel revolving door wherein substantially no obstruction is afforded to the ingress or egress of people, carts, materials, or the like relative thereto.

Also, it will be seen that the present invention affords a novel revolving door which is practical and efficient in operation, and which may be readily and economically produced commercially.

Thus, while I have illustrated and described the preferred embodiment of my invention, it is to be understood that this is capable of variation and modification, and I therefore do not wish to be limited to the precise details set forth, but desire to avail myself to such changes and alterations as fall within the purview of the following claims.

1 claim:

1. A revolving door comprising a. an elongated, substantially cylindrical-shaped 5 outer shell,

b. means for supporting said outer shell on a floor in substantially longitudinally upright position,

c. said outer shell comprising 1. a top wall,

2. an elongated side wall a. extending longitudinally downward from said top wall, and b. having two elongated openings in respective sides thereof and extending downwardly from the upper portion of said side wall through the lower edge of the latter, and 3. an annular ring mounted on the lower edge portion of said side wall and projecting radially in wardly thereof,

d. said opening being substantially unobstructed except for said ring,

e. an elongated. substantially cylindrical-shaped inner shell disposed in said outer shell,

f. said inner shell comprising 1. a top wall,

2. an elongated side wall a. extending longitudinally downwardly from said last mentioned top wall, and b. having an elongated opening in one side thereof extending downwardly from the upper portion of said last mentioned side wall through the lower edge thereof,

g. said shells being substantially round in transverse cross-section,

h. means operatively connecting said top walls together for rotatably supporting said inner shell for rotation around the longitudinal axis thereof within said outer shell and thereby moving said last mentioned opening into and out of registration with respective ones of said first mentioned openings,

i. said ring having annular track means concentrically disposed around said longitudinal axis of said outer shell, inwardly of said inner shell, and

j. follower means mounted on said inner shell and operatively engaged with said track means for holding the lower end portion of said inner shell against lateral movement during rotation of said inner shell around said axis of said outer shell.

2. A revolving door of the type defined in claim 1,

and in which a. said follower means are mounted on said side wall of said inner shell 3. A revolving door of the type defined in claim 2,

and in which a. said follower means project radially inwardly from the lower edge portion of said inner shell 4. A revolving door of the type defined in claim I,

and in which a. said track means comprise a convex-upwardly rib.

5. A revolving door of the type defined in claim 4,

and in which a. said follower means comprises rotatably mounted 6 wheels having a concavity extending around the periphery thereof, and

b. said rib is disposed in said concavity 6. A revolving door of the type defined in claim 1, and in which a. said track means comprises a concave-downwardly groove 7. A revolving door of the type defined in claim 6, and in which a. said follower means comprises rotatably mounted wheels having a rib extending around the periphery thereof, and

b. said rib is disposed in said groove 8. In a revolving door of the type having an elongated, substantially cylindrical-shaped outer shell, means for supporting said outer shell on a floor in substantially longitudinally upright position, with said outer shell comprising a top wall, an elongated side wall extending longitudinally downwardly from said top wall, and having two elongated openings in respective sides thereof said openings extending downwardly from the upper portion of said side walls through the lower edge of the latter, and an elongated, substantially cylindrical-shaped inner shell disposed in said outer shell, with sa d inner shell comprising a top wall, and elongated side wall extending longitudinally downwardly from said last mentioned top wall, and having an elongated opening in one side thereof extending downwardly from the upper portion of said last mentioned side wall through the lower edge thereof, said shells being substantially round in transverse cross-section, and means operatively connecting said top walls together for rotatably supporting said inner shell for rota tion around the longitudinal axis thereof within said outer shell and thereby moving said last mentioned opening into and out of registration with respective ones of said first mentioned openings, the combination of a. an annular ring mounted on the lower edge portion of said first mentioned side wall and projecting inwardly therefrom,

b. said ring 1. being constructed of sheet material having a vertical thickness of not substantially more than one-eighth of an inch, and 2. having an annular track a. disposed concentrically around said axis of said outer shell, b. off-set vertically from the horizontal plane of the remainder of said ring, and c. follower means I. mounted on the lower edge portion of said second mentioned side wall, and

2. operatively engaged with said track means for holding the lower edge portion of said inner shell against lateral movement relative to said outer shell.

9. A revolving door of the type adapted to be mounted in a doorway having jamb portions disposed at two opposite sides thereof, comprising a. an elongated, substantially cylindrical-shaped outer shell,

b. means supporting said shell in substantially upstanding position,

c. an elongated, substantially cylindrical'shaped inner shell disposed in said outer shell in co-axial relation thereto,

d. means supporting said inner shell for rotation around the longitudinal axis of said outer shell, and

e. means for releasably securing said door to the jamb of such a doorway, f. said last mentioned means comprising 1. abutment members adapted to be secured to said jamb portions on opposite sides of such a doorway, and 2. latch members mounted on said outer shell in position to frictionally engage respective ones of said abutment members in position to yeildingly hold said revolving door in said doorway g. said latch members being releasable from said abutment members to thereby permit said revolving door to be moved out of said doorway upon exertion of manual force against said revolving door in the direction that said latch members are disposed from said jambs.

10. A revolving door as defined in claim 9, and in which door is so mounted in said doorway. 

1. A revolving door comprising a. an elongated, substantially cylindrical-shaped outer shell, b. means for supporting said outer shell on a floor in substantially longitudinally upright position, c. said outer shell comprising
 1. a top wall,
 2. an elongated side wall a. extending longitudinally downward from said top wall, and b. having two elongated openings in respective sides thereof and extending downwardly from the upper portion of said side wall through the lower edge of the latter, and
 3. an annular ring mounted on the lower edge portion of said side wall and projecting radially inwardly thereof, d. said opening being substantially unobstructed except for said ring, e. an elongated, substantially cylindrical-shaped inner shell disposed in said outer shell, f. said inner shell comprising
 1. a top wall,
 2. an elongated side wall a. extending longitudinally downwardly from said last mentioned top wall, and b. having an elongated opening in one side thereof extending downwardly from the upper portion of said last mentioned side wall through the lower edge thereof, g. said shells being substantially round in transverse crosssection, h. means operatively connecting said top walls together for rotatably supporting said inner shell for rotation around the longitudinal axis thereof within said outer shell and thereby moving said last mentioned opening into and out of registration with respective ones of said first mentioned openings, i. said ring having annular track means concentrically disposed around said longitudinal axis of said outer shell, inwardly of said inner shell, and j. follower means mounted on said inner shell and operatively engaged with said track means for holding the lower end portion of said inner shell against lateral movement during rotation of said inner shell around said axis of said outer shell.
 2. an elongated side wall a. extending longitudinally downward from said top wall, and b. having two elongated openings in respective sides thereof and extending downwardly from the upper portion of said side wall through the lower edge of the latter, and
 2. a piston a. slidably mounted in said housing, and b. having a rounded end portion projecting outwardly from said housing, and
 2. an elongated side wall a. extending longitudinally downwardly from said last mentioned top wall, and b. having an elongated opening in one side thereof extending downwardly from the upper portion of said last mentioned side wall through the lower edge thereof, g. said shells being substantially round in transverse cross-section, h. means operatively connecting said top walls together for rotatably supporting said inner shell for rotation around the longitudinal axis thereof within said outer shell and thereby moving said last mentioned opening into and out of registration with respective ones of said first mentioned openings, i. said ring having annular track means concentrically disposed around said longitudinal axis of said outer shell, inwardly of said inner shell, and j. follower means mounted on said inner shell and operatively engaged with said track means for holding the lower end portion of said inner shell against lateral movement during rotation of said inner shell around said axis of said outer shell.
 2. A revolving door of the type defined in claim 1, and in which a. said follower means are mounted on said side wall of said inner shell
 2. latch members mounted on said outer shell in position to frictionally engage respective ones of said abutment members in position to yeildingly hold said revolving door in said doorway g. said latch members being releasable from said abutment members to thereby permit said revolving door to be moved out of said doorway upon exertion of manual force against said revolving door in the direction that said latch members are disposed from said jambs.
 2. operatively engaged with said track means for holding the lower edge portion of said inner shell against lateral movement relative to said outer shell.
 2. having an annular track a. disposed concentrically around said axis of said outer shell, b. off-set vertically from the horizontal plane of the remainder of said ring, and c. follower means
 3. a spring yeildingly urging said piston outwardly from said housing into position to dispose said end portion in said opening when said revolving door is so mounted in said doorway.
 3. A revolving door of the type defined in claim 2, and in which a. said follower means project radially inwardly from the lower edge portion of said inner shell
 3. an annular ring mounted on the lower edge portion of said side wall and projecting radially inwardly thereof, d. said opening being substantially unobstructed except for said ring, e. an elongated, substantially cylindrical-shaped inner shell disposed in said outer shell, f. said inner shell comprising
 4. A revolving door of the type defined in claim 1, and in which a. said track means comprise a convex-upwardly rib.
 5. A revolving door of the type defined in claim 4, and in which a. said follower means comprises rotatably mounted wheels having a concavity extending around the periphery thereof, and b. said rib is disposed in said concavity
 6. A revolving door of the type defined in claim 1, and in which a. said track means comprises a concave-downwardly groove
 7. A revolving door of the type defined in claim 6, and in which a. said follower means comprises rotatably mounted wheels having a rib extending around The periphery thereof, and b. said rib is disposed in said groove
 8. In a revolving door of the type having an elongated, substantially cylindrical-shaped outer shell, means for supporting said outer shell on a floor in substantially longitudinally upright position, with said outer shell comprising a top wall, an elongated side wall extending longitudinally downwardly from said top wall, and having two elongated openings in respective sides thereof said openings extending downwardly from the upper portion of said side walls through the lower edge of the latter, and an elongated, substantially cylindrical-shaped inner shell disposed in said outer shell, with said inner shell comprising a top wall, and elongated side wall extending longitudinally downwardly from said last mentioned top wall, and having an elongated opening in one side thereof extending downwardly from the upper portion of said last mentioned side wall through the lower edge thereof, said shells being substantially round in transverse cross-section, and means operatively connecting said top walls together for rotatably supporting said inner shell for rotation around the longitudinal axis thereof within said outer shell and thereby moving said last mentioned opening into and out of registration with respective ones of said first mentioned openings, the combination of a. an annular ring mounted on the lower edge portion of said first mentioned side wall and projecting inwardly therefrom, b. said ring
 9. A revolving door of the type adapted to be mounted in a doorway having jamb portions disposed at two opposite sides thereof, comprising a. an elongated, substantially cylindrical-shaped outer shell, b. means supporting said shell in substantially upstanding position, c. an elongated, substantially cylindrical-shaped inner shell disposed in said outer shell in co-axial relation thereto, d. means supporting said inner shell for rotation around the longitudinal axis of said outer shell, and e. means for releasably securing said door to the jamb of such a doorway, f. said last mentioned means comprising
 10. A revolving door as defined in claim 9, and in which a. each of said abutment members comprises a keeper plate having an opening therein, and b. each of said latch member comprises 